code: def testInvalidInput(self):
      # mel bands should fail for a spectrum with less than 2 bins
      self.assertComputeFails(ERBBands(), [])
      self.assertComputeFails(ERBBands(), [0.5])
  
file_path: essentia/test/src/unittests/spectral/test_erbbands.py
imports: from essentia_test import *
  import numpy
label_desc: Use image node_id 4 for calling the TestERBBands obj's underlying member method code with example usage: obj.testInvalidInput() without return types